forces and motion

Question 1

calculate average speed

Answer 1

distance moved/time taken

Question 2

what is a force

Answer 2

a push or a pull, exerted by one object on another

Question 3

what is newtons first law of motion

Answer 3

if no external force is acting and object will :
if stationary remain stationary
if moving keep moving at a steady speed

Question 4

what happens if forces are in balance

Answer 4

the cancel each other out

Question 5

name the effects force has on an object

Answer 5

• Force can make a stationary object move or make a moving object move faster
• Force can slow down or completely stop a moving object
• Force can change the direction of a moving object
• Force can change the shape or size of an object

Question 6

what is pressure

Answer 6

force/area
The force per unit area is pressure. The force on the object is spread over the surface area. The area where the force is applied is divided by the equation for pressure.

Question 7

what is the effect force has on pressure

Answer 7

a force acting over a smaller area will create more pressure.

Question 8

calculate pressure in a liquid

Answer 8

pressure = dgh
d= density
g=gravity
h=depth

Question 9

pressure in gases

Answer 9

the more particles that the walls, the higher the pressure.

Question 10

why does heat affect gas pressure

Answer 10

as a gas is heated up the particles gain more energy and move around more quickly they hit the walls harder and more often

Question 11

what happens when gas cools

Answer 11

cooler temp, less energy, less pressure